Master Charlie's wet weather wear (3)
I believe the answer is:
mac
'wet weather wear' is the definition.
'mac' can be an answer for 'wear' (mac is a kind of wear). I'm not certain of the 'wet weather' bit.
'master charlie's' is the wordplay.
'master' becomes 'ma' (Master of Arts).
'charlie' becomes 'C' (phonetic alphabet).
'ma'+'c'='MAC'
Can you help me to learn more?
(Other definitions for mac that I've seen before include "Raincoat (colloq.)" , "Waterproof raincoat, in short" , "It may help you keep dry" , "Overcoat" , "Coat - computer" .)